Reaorganize Gitlab-CI jobs and update LCG baseline versions
With this change we run CI builds on LCG 102b, 103, 104 and 105 (with a selection of compilers and build methods).
Edited by Marco Clemencic
With this change we run CI builds on LCG 102b, 103, 104 and 105 (with a selection of compilers and build methods).